Xcodeでcollection viewのオレンジ色がでません。

前提・実現したいこと

Xcode初心者です。
アイホンの電卓を作成しています。
collection viewでオレンジ色を出していますが、
「Label」で数値を入れたところ「run」でテストすると
数字は出ますが、オレンジ色のcollection viewが出なくなりました。
原因はおそらく「Label」で数値を入れたことによるものだと思われます。

コードを掲示するので原因と思われる箇所と解決方法をご教授していただければ幸いです。

ここに質問の内容を詳しく書いてください。
（例）PHP(CakePHP)で●●なシステムを作っています。
■■な機能を実装中に以下のエラーメッセージが発生しました。

発生している問題・エラーメッセージ

エラーはありません。

該当のソースコード

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// Use this method to optionally configure and attach the UIWindow window to the provided UIWindowScene scene.
// If using a storyboard, the window property will automatically be initialized and attached to the scene.
// This delegate does not imply the connecting scene or session are new (see application:configurationForConnectingSceneSession instead).
guard let _ = (scene as? UIWindowScene) else { return }
}

func sceneDidDisconnect(_ scene: UIScene) {
    // Called as the scene is being released by the system.
    // This occurs shortly after the scene enters the background, or when its session is discarded.
    // Release any resources associated with this scene that can be re-created the next time the scene connects.
    // The scene may re-connect later, as its session was not necessarily discarded (see `application:didDiscardSceneSessions` instead).
}

func sceneDidBecomeActive(_ scene: UIScene) {
    // Called when the scene has moved from an inactive state to an active state.
    // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
}

func sceneWillResignActive(_ scene: UIScene) {
    // Called when the scene will move from an active state to an inactive state.
    // This may occur due to temporary interruptions (ex. an incoming phone call).
}

func sceneWillEnterForeground(_ scene: UIScene) {
    // Called as the scene transitions from the background to the foreground.
    // Use this method to undo the changes made on entering the background.
}

func sceneDidEnterBackground(_ scene: UIScene) {
    // Called as the scene transitions from the foreground to the background.
    // Use this method to save data, release shared resources, and store enough scene-specific state information
    // to restore the scene back to its current state.
}

}